No, you can’t put two plecos in the same tank. Although plecos are mainly peaceful, they often get territorial and aggressive with other plecos, especially if they’re kept in a small tank.
If you have a large tank, you can try introducing two baby plecos into a tank simultaneously. If you’re lucky, they might be able to live together peacefully. However, they might still eventually grow up to be aggressive towards each other.
Additionally, many species of plecos tend to grow to be very big. In order to safely keep more than one pleco together, you will need a very large tank as well.
If you don’t want your plecos to be lonely, consider these fish instead: